Physical properties of the quasi-two-dimensional square lattice antiferromagnet 
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Jang, Tae-Hwan; Do, Seung-Hwan; Lee, Minseong; Wu, Hui; Brown, Craig M.; Christianson, A. D.; Cheong, Sang‐Wook; Park, Jaehoon

doi:10.1103/physrevb.104.214434

Cited by 15 publications

(8 citation statements)

References 38 publications

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“…The combination of a relatively large spin-orbit coupling (λ ~20 meV) and a dominant tetrahedral crystal field (Δ Td ), splits the free-ion levels, 5 D (L = 2, S = 2), into several multiplets. The lowest energy S ¼ 2 multiplet has a significant orbital character due to the finite spin-orbit coupling, that combined with the tetragonal distortion (δ Tetra ) by large compression of the FeO 4 tetrahedra leads to a rather strong easy-plane single-ion anisotropy 43,44 . The five S ¼ 2 energy levels are then split into a singlet S z ¼ 0 ground state and two excited S z ¼ ±1 and S z ¼ ±2 doublets with energies D and 4D, respectively (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet

Zhang

Williams

et al. 2021

Nat Commun

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An ongoing challenge in the study of quantum materials, is to reveal and explain collective quantum effects in spin systems where interactions between different modes types are important. Here we approach this problem through a combined experimental and theoretical study of interacting transverse and longitudinal modes in an easy-plane quantum magnet near a continuous quantum phase transition. Our inelastic neutron scattering measurements of Ba2FeSi2O7 reveal the emergence, decay, and renormalization of a longitudinal mode throughout the Brillouin zone. The decay of the longitudinal mode is particularly pronounced at the zone center. To account for the many-body effects of the interacting low-energy modes in anisotropic magnets, we generalize the standard spin-wave theory. The measured mode decay and renormalization is reproduced by including all one-loop corrections. The theoretical framework developed here is broadly applicable to quantum magnets with more than one type of low energy mode.

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Section: Resultsmentioning

confidence: 99%

Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet

Zhang

Williams

et al. 2021

Nat Commun

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“…For example, an S = 2 system can be well described in a subspace spanned by |S z = 0 and |S z = ± 1 at a zero field. This is actually confirmed in Ba 2 FeSi 2 O 7 (S = 2) [44][45][46][47] . Particularly in ref.…”

Section: Discussionmentioning

confidence: 52%

Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets

et al. 2023

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Bose–Einstein condensation (BEC) in quantum magnets, where bosonic spin excitations condense into ordered ground states, is a realization of BEC in a thermodynamic limit. Although previous magnetic BEC studies have focused on magnets with small spins of S ≤ 1, larger spin systems potentially possess richer physics because of the multiple excitations on a single site level. Here, we show the evolution of the magnetic phase diagram of S = 3/2 quantum magnet Ba2CoGe2O7 when the averaged interaction J is controlled by a dilution of magnetic sites. By partial substitution of Co with nonmagnetic Zn, the magnetic order dome transforms into a double dome structure, which can be explained by three kinds of magnetic BECs with distinct excitations. Furthermore, we show the importance of the randomness effects induced by the quenched disorder: we discuss the relevance of geometrical percolation and Bose/Mott glass physics near the BEC quantum critical point.

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“…This also applies to BaFe 4 O 7 , which breaks down at ∼650 °C . The stability of Ba 2 FeSi 2 O 7 , however, is potentially higher since it can be obtained with a 96.5% phase purity via a solid state reaction at 1050 °C. , Sanbornite (BaSi 2 O 5 ) and BaSiO 3 , meanwhile, both seem to be stable up to relatively high temperatures. − The latter has even been shown to have catalytic properties …”

Section: Resultsmentioning

confidence: 99%

Discovery of Oxygen Carriers by Mining a First-Principle Database

et al. 2023

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Chemical looping is an innovative technique that relies, to a large extent, on the possibility of finding new oxygen carriers. Until now, these materials have primarily been identified via experimental techniques and therefrom derived insights. However, this is both costly and time-consuming. To speed-up this process, we have applied a computational screening approach based on energetic data retrieved from the Open Quantum Materials Database. In particular, we have considered combinations of all mono-, bi-, and trimetallic alloys and mixed oxides with up to three distinctive phases. Here, we specifically focus on a technique referred to as chemical looping oxygen uncoupling, which is especially suitable for solid fuels, e.g., combustion of biomass for negative CO 2 emissions. The formation energies obtained for the materials of interest were used to identify phase transitions that are likely to occur under conditions relevant for chemical looping oxygen uncoupling. Given these criteria, the initial list of 300000 materials is reduced by a factor of 20, and after filtering out rare, radioactive, toxic, or harmful elements only 1000 remain. When considering the abundance of elements in the ranking criteria, most of the highest ranking phases include Cu, Mn, and Fe. This adds credibility to the procedure, as many viable oxygen carriers for chemical looping oxygen uncoupling that have been studied experimentally contain these elements. While Cr-based materials have not been widely explored for this application, our study suggests that this might be worthwhile since these occur more frequently than Fe. Other elements that would be interesting as additional components include Ba, K, Na, Al, and Si.

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Physical properties of the quasi-two-dimensional square lattice antiferromagnet Ba2FeSi2O7

Cited by 15 publications

References 38 publications

Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet

Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet

Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets

Discovery of Oxygen Carriers by Mining a First-Principle Database

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